Information browser, method of controlling same, and program

ABSTRACT

A meta-information-read unit, a display-cache unit, a pre-reading-cache unit, a display-state-management unit, an operation-input unit, a meta-information-pre-reading unit, and an input-operation-determination unit are provided. The meta-information-pre-reading unit changes a pre-reading condition and pre-reads meta information on the basis of a result of determination made by the input-operation-determination unit and display-state-management information managed by the display-state-management unit.

CROSS REFERENCE OF RELATED APPLICATIONS

This application is a Continuation of U.S. patent application Ser. No.11/775,153 filed on Jul. 9, 2007, which claims the benefit of JapanesePatent Application No. 2006-196003 filed on Jul. 18, 2006, the contentsof which are hereby incorporated by reference herein in their entirety.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an information browser and particularlyrelates to an information browser configured to pre-read metainformation and a method of pre-reading information.

2. Description of the Related Art

In recent years, many digital-versatile-disk (DVD) recorders including ahard-disk drive and many devices configured to accumulate digital-videocontents so that a user can browse the digital-video contents that areavailable. The main function of the DVD recorder is to digitally recorda television broadcast so that the user can view the televisionbroadcast. Additionally, private contents obtained through adigital-still camera, a digital-video camera, and so forth can beaccumulated on the DVD recorder so that the user can browse the privatecontents.

Further, systems configured to uniquely manage contents accumulated on aplurality of digital-video-content servers including adigital-living-network alliance (DLNA), a media server, and so forth sothat a user can browse the accumulated contents have become rapidlyavailable. Each of the above-described systems is configured to transferdigital-video contents accumulated by using a local-area-network (LAN)environment constructed in a household and decode the digital-videocontents in real time so that the user can view the digital-videocontents (for example, refer to “Digital Living Network Alliance”,[online], [retrieved on Jul. 12, 2006], the Internet

<http://www.dlna.org/about/DLNA_Overview.pdf>). When another contentserver is added to the system, the user can easily handle an increasednumber of accumulated contents. Further, the user can search for and/orview all of the contents without minding the server storing thecontents.

Usually, for generating a screen image used for retrieving contents,each of the above-described systems collects meta-data items relating toall of the accumulated contents from all of the content servers, andgenerates the content-retrieval-screen image after the meta-data itemsare obtained.

According to the above-described method, however, considerable time isconsumed to generate an initial screen image, due to an increased numberof contents. Moreover, the memory resource in a display apparatus maybecome insufficient. For avoiding the above-described problems, a methodof collecting only meta data relating to contents necessary for displaymay be considered. According to the above-described method, however, themeta data necessary for display is collected each time the display statechanges. In that case, latency time occurs before the next screen imageis displayed, which makes it difficult for the user to perform aretrieval operation comfortably.

On the other hand, in the case where an Internet browser is used,home-page data generated by using Hypertext Markup Language (HTML) orthe like is downloaded to a browser terminal, and the home-page data isdisplayed. In the past, in the case where the Internet browser is used,a user specifies a link destination by using a mouse or the like andstarts downloading home-page data obtained at the link destination.Therefore, even though an interactive operation is performed, the userhas to wait until the downloading is finished. For avoiding theabove-described problem, there have been proposed various technologiesfor pre-reading the home-page data obtained at the link destination andan application program necessary to display the home-page data beforethe link destination is specified.

Further, there has been proposed a technology for determining whether ornot information about the link destination, the information beingsubjected to pre-reading, had already been downloaded, and pre-readingonly information that had not been downloaded so that the pre-readingefficiency is increased. The above-described technology is disclosed inJapanese Patent Laid-Open No. 2000-305836, for example.

Further, there has been proposed a technology for managing the accesslog of a user, analyzing the access log, and downloading informationabout a link destination according to the inclination and access patternof the user so that downloading of unnecessary information is reducedand the pre-reading efficiency is increased. The above-describedtechnology is disclosed in Japanese Patent Laid-Open No. 2004-280405,for example.

There has been proposed a technology for monitoring the position of amouse cursor, predicting an operation performed by a user, and assigningpriority to information for pre-reading so that the pre-readingefficiency is increased. The above-described technology is disclosed inJapanese Patent Laid-Open No. 2002-251315 and Japanese Patent Laid-OpenNo. 2005-085174, for example.

However, the above-described technologies allow for pre-readinginformation about static link destinations arranged on the Internet in atwo-dimensional manner. Therefore, the above-described technologies onlyallow for pre-reading the link-destination information imbedded indisplayed information generated by using HTML or the like. Further, acontinuous same operation is not considered in the above-describedtechnologies. Therefore, when information about images or the like isviewed through slideshow with high speed, pre-reading operations lagbehind display operations performed to achieve the slideshow, whichmakes it difficult for a user to browse through the informationcomfortably.

SUMMARY OF THE INVENTION

An embodiment of the present invention provides an information browser,a method of controlling the information browser, and a program that cansolve or at least mitigate the above-described problems and allow a userto perform browsing comfortably even though a continuous input operationis performed.

According to an aspect of the present invention, an information browseraccording to an embodiment includes a meta-information-read unitconfigured to read meta information, a display-storage unit configuredto store first image information read by the meta-information-read unit,a display unit configured to generate a display-screen image by usingthe first image information stored by the display-storage unit, adisplay-state-management unit configured to manage a state of thedisplay-screen image generated by the display unit, animage-information-pre-reading unit configured to pre-read second imageinformation by using the meta-information-read unit based ondisplay-state-management information managed by thedisplay-state-management unit, and a pre-reading-storage unit configuredto store the second image information pre-read by theimage-information-pre-reading unit.

According to another aspect of the present invention, the condition ofcontent-meta information for pre-reading is dynamically changedaccording to the state of the input operation so that a user can browsethe content-meta information comfortably even though the continuousinput operation is performed.

Other features and advantages of the present invention will be apparentfrom the following description taken in conjunction with theaccompanying drawings, in which like reference characters designate thesame or similar parts throughout the figures thereof.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute apart of the specification, illustrate embodiments of the invention and,together with the description, serve to explain the principles of theinvention.

FIG. 1 shows the configuration of an embodiment of the presentinvention.

FIG. 2 is a flowchart showing processing procedures performed topre-read meta information according to a first embodiment of the presentinvention.

FIG. 3 shows a screen image displayed on a display monitor anddisplay-state-management information according to the first embodiment.

FIG. 4 is a flowchart showing processing procedures performed topre-read the meta information, when an input operation is performed,according to the first embodiment.

FIG. 5 is a flowchart showing processing procedures performed topre-read the meta information, when an input operation is performed,according to a second embodiment of the present invention.

FIG. 6 shows a screen image displayed on a display monitor anddisplay-state-management information according to the second embodiment.

DESCRIPTION OF THE EMBODIMENTS

Hereinafter, preferred embodiments of the present invention will now bedescribed in detail in accordance with the accompanying drawings. It isto be understood that the following embodiments do not limit the scopeof the appended claims, and not all combinations of features describedin the following embodiments may be required to achieve the presentinvention.

First Embodiment

Hereinafter, a first embodiment of the present invention will bedescribed with reference to the attached drawings. FIG. 1 shows anexample configuration of an information browser and aninformation-browsing system according to the first embodiment. A contentserver 101 is provided, so as to accumulate digital contents. Thecontent server 101 functions, as a storage server accumulating not onlyvideo contents including video and/or a still image, but also an officedocument typified by a document file. A meta-information-storage unit102 is provided, so as to accumulate meta information relating to theaccumulated contents, and a database engine 103 is provided, so as tomanage, record, and read the meta information stored in themeta-information-storage unit 102.

Further, an information browser 111 according to the first embodiment isprovided, so as to display a screen image used for retrieve the contentsaccumulated on the content server 101 and/or reproduce and display thecontents. A communication unit 112 is provided, so as to transmit and/orreceive a command, the meta information, and the content data betweenthe communication unit 112 and the content server 101. In the firstembodiment, the content server 101 and the information browser 111 aredescribed, as separate devices connected to each other via thecommunication unit 112. However, the meta-information-storage unit 102and the database engine 103 may be integrated into the informationbrowser 111.

A meta-information-read unit 113 generates and transmits a command tothe content server 101 via the communication unit 112, so as to make arequest to read the meta information. A meta-information-cache unit 114functioning as a meta-information-storage unit is provided, so as tocache or store the read meta information. A display-cache unit 115functioning, as a display-storage unit, is provided, so as to cache metainformation used for actual display. A display-state-management unit 116is provided, so as to manage the display state in synchronization withthe display-cache unit 115.

A user-interface (UI) renderer 117 functioning, as a display unit, isprovided, so as to generate a graphical user interface (GUI)functioning, as a display-screen image, on the basis of the metainformation stored in the display-cache unit 115 and managementinformation managed by the display-state-management unit 116. A displaymonitor 118 functioning, as a display device, is provided, so as todisplay the display-screen image generated by the UI renderer 117.

A pre-reading-condition-generation unit 119 is provided, so as togenerate pre-reading conditions on the basis of thedisplay-state-management information managed by thedisplay-state-management unit 116. Pre-reading-cache units 120, 121, and122 functioning, as pre-reading-storage units, are provided, so as tocache pre-read meta information for each of the pre-reading conditions.Further, an operation-input unit 123, an input device 124, and aninput-operation-determination unit 125 are provided, where theinput-operation-determination unit 125 determines details on an inputoperation. Here, the meta information may include data on a thumbnailimage of contents other than information about the content name, thecontent type, the date of creation, the content size, and so forth.

Each of FIGS. 2 and 4 shows a flowchart illustrating operationsperformed by the information browser 111 according to the firstembodiment. The flowchart shown in FIG. 2 illustrates processingprocedures performed from when the information browser 111 is started towhen pre-reading of the meta information is finished. First, when theinformation browser 111 is started, at step S201, meta informationrequired to generate an initial-screen image is collected and stored inthe display-cache unit 115, at step S202.

Then, the display-state-management unit 116 that had collected the metainformation generates display-state-management information, at stepS203. The display-state-management information includes informationabout displayed contents, and particularly includes information such ascontent identification (ID) provided, so as to uniquely identifycontents, and information about an input operation performed on adisplayed screen image, which changes the displayed screen image.Concurrently with the generation of the display-state-managementinformation, the UI renderer 117 generates a user interface by using themeta information cached in the display-cache unit 114, and displays thegenerated user interface on the image screen of the display monitor 118,at step S204. Further, the pre-reading-condition-generation unit 119generates the pre-reading conditions on the basis of thedisplay-state-management information, at step S205. Then, the metainformation is pre-read through the meta-information-read unit 113 onthe basis of the above-described pre-read conditions and the pre-readmeta information is stored in at least one of the pre-reading-cacheunits 120 to 122 on a condition-by-condition basis, at step S206.

Here, the pre-reading condition is the condition corresponding to theinput operation, which changes the displayed screen image, where theinput-operation information is included in the display-state-managementinformation. Namely, the pre-reading condition is required to collectmeta information necessary to change the sort order and/or narrow downcontents, for example.

FIG. 3 shows a screen image displayed on the display monitor 118, thedisplay-state-management information, and a simplified diagram of therelationship between a display cache and a pre-reading cache. FIG. 3shows an example display-screen image 301 displayed on the displaymonitor 118. Hereinafter, the display-screen image 301 will bedescribed, as a widely used film-strip-screen image. However, details onthe display-screen image 301 may not be limited to those on thefilm-strip-screen image.

A group of thumbnails 302 shows part of the content list, and contents303 are shown in a size larger than those of the thumbnails, which meansthat the contents 303 come into focus. Property information 304 showsthe property of displayed contents. The property information includesinformation about the file name of the contents that come into focus,and the tag of the contents, for example. Further, the propertyinformation includes information about a narrow-down condition, a sortcondition, and so forth, as information about the display state.However, details on the property information are not limited to thoseshown in the first embodiment.

When each of operations 305 and 306 is performed, details on thedisplayed screen image are changed. Although all of the operations areshown in FIG. 3 for the sake of description, another method may be used,so as to display the operations. For example, if a left-shift button 305used for achieving the left-shift operation is selected, the thumbnailgroup 302 is shifted to the left and another thumbnail appears from theright. Further, if a button “sort order: type” used for achieving theoperation 306 is selected, the sort order is changed centering on theimage which comes into focus, and thumbnails arranged on both sides ofthe thumbnail that comes into focus are changed.

Display-state-management information 311 is provided, as exampledisplay-state-management information. The display-state-managementinformation 311 includes currently displayed information and operationinformation that can be input at present by performing an inputoperation. In the field of a display cache 321 shown in FIG. 3, detailson meta-information items are omitted. The meta-information items areshown in groups and each of the groups is indicated by a file name. Inthe field of a pre-reading cache 331, details on meta-information itemsare omitted, as is the case with the display cache 321. However,pre-read content-meta information is stored in the pre-reading cache 331for each of operations written in the display-state-managementinformation, that is, input operations that can be performed. In thisspecification, a method of acquiring overlapping meta-information itemsof the content-meta information stored in the display cache 321 and thepre-reading cache 331 will not be described.

FIG. 4 is a flowchart illustrating processing procedures performed fromwhen an input operation is performed (i.e., when information about theinput operation is transmitted to the information browser 111) to whencontent-meta information is pre-read in response to the input operation,according to the first embodiment. First, the process waits for anoperation input at step S401. When the information about the inputoperation is received (at step S401) and no change occurs in a displayedscreen image (at step S402), and if it is determined that an inputoperation to terminate the processing is received at step S403,terminate processing is performed to terminate the processingprocedures. The cached meta information may be retained, or the contentsof the cache may be abandoned during the terminate processing. However,if the cached meta information is retained, a screen image can bedisplayed without delay when the information browser 111 is started nexttime.

If a change occurs in the displayed screen image due to the inputoperation, at step S402, an input-operation-determination unit 125determines whether or not information about a continuous same operationis input, at step S404. The continuous same operation denotes a casewhere the same key is pressed down over a predetermined time period,that is, for example, where a button of a remote-control key iscontinuously pressed down over a defined time period and/or a case wherethe same key is repeatedly pressed down at least a defined number oftimes within a defined time period.

If it is determined that the continuous-same operation is not performed,at step S404, a pre-reading cache satisfying an operation condition isappropriated to a display cache. The display cache that had been used bythen is used, as a cache used for performing the next pre-reading, atstep S411. In that case, however, the display cache is dynamicallyappropriated to the pre-reading cache. However, the display cache may befixed and contents of the pre-reading cache may be copied to the displaycache.

When the meta information is prepared in another display cache, the UIrenderer 117 generates and displays a user interface, at step S412. Atthe same time, the display-state-management information is updated, atstep S413, and the meta information is pre-read on the pre-readingcondition, at step S415.

If it is determined that the continuous-same operation is performed, atstep S404, the pre-reading cache satisfying the operation condition isappropriated to the display cache, and the display cache that had beenused by then is used, as a cache used for performing the nextpre-reading, at step S421, as is the case where the continuous-sameoperation is not performed.

Next, when the meta information is prepared in another display cache,the UI renderer 117 generates and displays a user interface, at stepS422. At the same time, the display-state-management information isupdated, at step S423.

Here, when the continuous same operation is performed, another operationis performed instantaneously on rare occasion. Usually, a user stopsperforming an operation, confirm a still-image screen, and performs thenext operation. Therefore, compared to pre-reading processing performedfor executing another operation, pre-reading processing is assignedhigher priority and performed, so as to perform the continuous sameinput operation, so that the load of performing unnecessary pre-readingcan be reduced. Therefore, the priority of the pre-reading processing ischanged, at step S423, and the meta information is pre-read on thepre-reading condition, at step 425.

By performing the above-described processing procedures, an informationbrowser and a pre-reading method that allow the user to perform browsingcomfortably during the continuous input operation can be provided.Further, an interactive user interface can be achieved with a fastresponse while saving memory.

Second Embodiment

Hereinafter, a second embodiment of the present invention will bedescribed with reference to the attached drawings. Here, the same orsimilar components or functional units as those used in the firstembodiment will not be described. FIG. 5 is a flowchart illustratingprocessing procedures performed from when an input operation isperformed (i.e., when information about the input operation istransmitted to an information browser) to when content-meta informationis pre-read in response to the input operation, according to the secondembodiment. The difference between the first and second embodimentsrelates to the processing procedures performed when it is determinedthat the continuous same operation is performed, at step S504.

If it is determined that the continuous same operation is performed, atstep S504, a pre-reading cache satisfying the operation condition isappropriated to the display cache, and the display cache that had beenused by then is used, as a cache used for performing the nextpre-reading, at step S521. Next, when the meta information is preparedin another display cache, the UI renderer 117 generates and displays auser interface, at step S522. At the same time, thedisplay-state-management information is updated, at step S523.

The above-described processing procedures are the same as thoseperformed in the first embodiment. As has been described in the firstembodiment, another operation can be performed instantaneously on rareoccasion when the continuous same operation is performed. Therefore, apart of or the entire pre-reading cache used for performing anotheroperation is appropriated to a pre-reading cache used for performing thecontinuous same operation so that the number of contents that can becached is increased. Subsequently, transition from one display-screenimage to another can be achieved with increased speed.

Then, the display-state-management information is updated, at step S523and the pre-reading cache is appropriated to a cache used for performingthe continuous operation, at step S524. Further, the meta information ispre-read on the pre-reading condition, at step S525.

FIG. 6 shows a screen image displayed on the display monitor 118,display-state-management information, and a simplified diagram of therelationship between a display cache and a pre-reading cache. In FIG. 6,details on an example display-screen image 601, a group of thumbnails602, contents 603, property information 604, operations 605 and 606,display-state-management information 611, a display cache 621, and apre-reading cache 631 are the same as those on the exampledisplay-screen image 301, the group of thumbnails 302, the contents 303,the property information 304, the operations 305 and 306, thedisplay-state-management information 311, the display cache 321, and thepre-reading cache 331 that are shown in FIG. 3. According to thedisplay-state-management information 611, a right-shift operation iscontinuously performed for the contents 603. Theoperation-input-determination unit 125 determines that thecontinuous-same operation is performed and information about thedetermination is reflected in the display-state-management information.

In the pre-reading cache, if the continuous operation inputs are nottransmitted, the pre-reading cache is appropriated to each of possibleoperations, and the meta information is pre-read. If the continuousoperation inputs are transmitted, part of the above-described caches isappropriated to a pre-reading cache used for performing a right-shiftoperation, so as to be ready for the continuous operation. Further,according to FIG. 6, a pre-reading cache used for performing aleft-shift operation is left. According to the above-describedconfiguration, even though target contents slip away due to overrun, theuser can return to the target contents immediately. Here, sinceinformation stored in the left-shift-pre-reading cache is the same asthe next previous information stored in the display cache, furtherpre-reading may not be performed.

Further, the number of caches to be appropriated may be adjusted on thebasis of the line status of the communication unit 112 and/or the timeintervals at which the continuous-same operation is received so thatinformation about the continuous-same operation is reflected in theprocessing procedures. Subsequently, the number of meta-informationitems relating to contents for pre-reading can be changed.

Further, not all items of the meta information are necessary while thesame operation is performed continuously. According to the configurationshown in FIG. 6, for example, only information about the thumbnails,names, and dates of contents is required, as the meta information. Whenthe continuous-same operation is performed, unnecessary traffic can bereduced by dynamically changing a meta-information item for pre-readingto another.

By performing the above-described processing procedures, an informationbrowser and a pre-reading method allowing the user to perform browsingcomfortably during the continuous input operation can be provided.Subsequently, an interactive user interface can be achieved with a fastresponse while saving memory.

Each of the units included in the information browser according to eachof the first and second embodiments of the present invention, and eachof the steps performed according to the method of controlling theinformation browser according to each of the first and secondembodiments can be achieved through operations performed by a programstored in a random-access memory (RAM), a read-only memory (ROM), and soforth of a computer. The above-described program and a computer-readablerecording medium storing the program also constitute the presentinvention.

According to another embodiment of the present invention, theconfigurations and/or functions of the above-described embodiments canbe achieved by using a system, an apparatus, a method, a program, arecording medium, and so forth. More specifically, the configurationsand/or functions of the above-described embodiments can be achieved byusing a single apparatus.

Further, the present invention can also be achieved by supplying programcode of software achieving the functions of the above-describedembodiments to a system and/or an apparatus directly and/or from aremote location. Then, a computer of the system and/or the apparatusreads and executes the supplied program code so that the functions ofthe above-described embodiments are achieved.

Therefore, the program code itself installed in the above-describedcomputer, so as to achieve the functional processing of the presentinvention, also achieves the present invention. Namely, a computerprogram executing functional processing of the present invention canalso constitute the present invention. In that case, the computerprogram may be object code, a program executed by an interpreter, scriptdata supplied to an operating system (OS), and so forth, as long as ithas the program function.

Further, the functions of the above-described embodiments can beachieved not only by a computer executing the read program, but also byan OS or the like running on the computer and executing part of or theentire actual processing on the basis of instructions of the program.

In another embodiment of the present invention, the program read fromthe storage medium may be written into a memory provided in a functionexpansion board inserted in the computer and/or a function expansionunit connected to the computer. The part of or the entire actualprocessing may be executed by a central-processing unit (CPU) or thelike provided in the function expansion board and/or the functionexpansion unit on the basis of instructions of the program so that thefunctions of the above-described embodiments are achieved.

While the present invention has been described with reference toexemplary embodiments, it is to be understood that the invention is notlimited to the disclosed exemplary embodiments. The scope of thefollowing claims is to be accorded the broadest interpretation so as toencompass all modifications, equivalent structures and functions.

1. (canceled)
 2. An information browser comprising: ameta-information-read unit configured to read meta information includedin contents; a display-storage unit configured to store the metainformation read by the meta-information-read unit for display; adisplay unit configured to generate a display-screen (image) by usingthe meta-information stored by the display-storage unit; adisplay-state-management unit configured to manage a state of thedisplay-screen image generated by the display unit; an operation inputunit configured to perform a plurality of different input operations; agenerating unit configured to generate pre-reading conditions eachcorresponding to each of the plurality of different input operationsassociated with the change in display-screen (image) of the displayeddisplay screen (image) based on display-state-management informationmanaged by the display-state-management unit; ameta-information-pre-reading unit configured to pre-read the metainformation by using the meta-information-read unit based on thepre-read condition generated by the generating unit; and apre-reading-storage unit configured to store the meta informationpre-read by the meta-information-pre-reading unit to a plurality ofpre-reading-storage sections.
 3. The information browser according toclaim 2, further comprising: an input-operation-determination unitconfigured to determine the input operation performed by the operationinput unit, wherein the meta-information-pre-reading unit changes thepre-reading condition on the basis of the display-state-managementinformation and a result of the determination made by theinput-operation-determination unit.
 4. The information browser accordingto claim 2, wherein the contents is a plurality of contents, and whereinthe plurality of input operations is an operation relating to thesorting order for displaying the plurality of contents by the displayunit.
 5. The information browser according to claim 2, wherein theoperation relating to the sorting order includes at least a shift, afocus, or a sort of the contents.
 6. The information browser accordingto claim 2, wherein the pre-reading-storage section is provided for eachof information items included in the display-state-managementinformation, where each of the information items can be input throughthe input operation, wherein the meta-information-pre-reading unit readsthe meta information for every input operation that can be performed,and wherein the pre-reading-storage unit stores the meta informationread for each of the input operations that can be performed in each ofthe plurality of pre-reading-storage sections.
 7. The informationbrowser according to claim 3, wherein theinput-information-determination unit determines whether or not a sameinput operation is continuously performed.
 8. The information browseraccording to claim 7, wherein when the input-operation-determinationunit determines that the continuous same input is performed, themeta-information-pre-reading unit assigns priority to meta-informationrelating to the continuous same input operation and reads the imageinformation to which the priority is assigned.
 9. The informationbrowser according to claim 7, wherein when theinput-operation-determination unit determines that the continuous sameinput is performed, the pre-reading-storage unit appropriates part ofand/or all of the plurality of pre-reading-storage sections to a storagesection configured to store the meta information relating to thecontinuous same input operation.
 10. The information browser accordingto claim 7, wherein when the input-operation-determination unitdetermines that the continuous same input operation is performed, thenumber of at least one piece of meta information read by themeta-information-pre-reading unit is changed.
 11. The informationbrowser according to claim 7, wherein when theinput-operation-determination unit determines that the continuous sameinput operation is performed, an item of at least one piece of metainformation read by the meta-information-pre-reading unit is changed.12. A method of controlling an information browser, the methodcomprising: reading meta information included in contents; storing theread meta information for display; generating a display screen (image)by using the stored meta information; managing a state of the generateddisplay-screen (image) by a display-state-management unit; performing aplurality of different input operations, by the operation input unit;generating pre-reading conditions each corresponding to each of theplurality of different input operation associated with the change indisplay-screen (image) of the displayed display screen (image) based ondisplay-state-management information managed by thedisplay-state-management unit; pre-reading the meta information by usingthe meta-information-read unit based on the generated pre-readcondition; and storing the pre-read meta information to a plurality ofpre-reading-storage sections.
 13. A non-transitory computer readablestorage medium storing a program allowing a computer to execute themethod according to claim 12.